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作者： Fang, Xianyong Shen, Feng Guo, Yanwen Jacquemin, Christian Zhou, Jian Huang, Shanchun Key Lab. of Intelligent Computing and Signal Processing Anhui University Hefei230601 China State Key Lab. for Novel Software Technology Nanjing University Nanjing210023 China AMI LIMSI-CNRS Orsay91403 France

ISBN: (纸本)9781479957514

Despite numerous efforts on blur measurement of partially blurred images, there still lacks an effective blur measure that is both pixel-wise and locally sharp consistent. The paper proposes a novel method with two contributions to overcome this limitation: 1) A new pixel-based blur metric, Multi-resolution Singular Value (MSV), which leverages the average singular value of high frequency bands to measure the blur of each pixel, and 2) a locally continuous strategy, maximum-likelihood estimation (MLE) based refinement, that ensures local continuity by imposing the local sharp consistency on pixel blur in a local correcting process. Experimental results show that our method is effective to smoothly measure the partially blurred images without local discontinuity. © 2014 IEEE.

关键词： Pixels

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Real-time control for traffic signal based on fuzzy hybrid petri net

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Journal of Computational Information systems 2014年第5期10卷 2079-2090页

作者： Tian, Zhao Zhang, Zundong Dong, Honghui She, Wei Ye, Yangdong Jia, Limin State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China Beijing Key Lab. of Urban Road Transportation Intelligent Control Technology North China University of Technology Beijing 100041 China Beijing Research Center of Urban Trafic Information Intelligent Sensing and Service Technologies Beijing 100044 China School of Information Engineering Zhengzhou University Zhengzhou 450052 China

According to the problem of not making full use of the road resources and not adapting the changeable traffic situation based on the traffic lights with the fixed cycle and the fixed phase sequence, this paper defines a kind of Fuzzy Hybrid Petri nets (FHPN) to simulate the real-time control for the traffic signal. The traffic signal control based on the Fuzzy Hybrid Petri nets not only can compute the best green light duration of each phase in time but also can determine the reasonable and alterable phase sequence. The simulation analysis shows that the real-time traffic signal control based on the Fuzzy Hybrid Petri nets can reduce furthest the count of the vehicle second stops, so the average delay time of the vehicles and the passengers can be reduced. © 2014 Binary Information Press.

关键词： Real time control

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A collab.rative method for business process oriented requirements acquisition and refining

A collaborative method for business process oriented require...

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2014 International Conference on Software and systems Process, ICSSP 2014

作者： Lai, Han Peng, Rong Ni, Yuze State Key Lab. of Software Engineering Computer School Wuhan University Wuhan China Chongqing Key Lab. of Electronic Commerce and Supply Chain System Chongqing Technology and Business University Chongqing China School of Computer Science and Information Engineering Chongqing Technology and Business University Chongqing China

ISBN: (纸本)9781450327541

Requirements Elicitation (RE) is a critical process in system/software engineering. Its goal is to capture the stakeholders expectations, needs and constraints, which can be elicited, analyzed and specified as requirements. Gathering the requirements correctly, clearly and completely in a natural way is a typical challenging problem, because requirements analysts always play key roles in the elicitation process dominantly while stakeholders participate in passively. In this paper, we propose a collective intelligence driven business process oriented requirements acquisition and refining method. Its aim is to reduce the requirements analysts dominance and promote stakeholders self-expression and self-improvement to elicit requirements clearly and completely. It adopts the group storytelling method to promote the collab.ration and communication among stakeholders, utilizes the narrative network model to enhance the associations among story fragments, and introduces dialogue game theory to guide the progressive refining. At the same time, the activity theory is adopted as the description framework to present the method and an application example is introduced. Finally, a pilot experiment is carried out to evaluate its perceived usefulness and perceived ease of use;and the actual quality of the requirements based on the degree of completeness and understandability in comparison with JAD. The results show that the requirements elicited by BPCRAR are more complete and understandable than JAD. In addition, the BPCRAR is perceived usefulness and ease of use in the experiment. © 2014 ACM.

关键词： Refining

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Evaluating the BPCRAR Method: A Collab.rative Method for Business Process Oriented Requirements Acquisition and Refining

Evaluating the BPCRAR Method: A Collaborative Method for Bus...

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1st Asia Pacific Requirements Engineering Symposium, APRES 2014

ISBN: (纸本)9783662436097

The goal of requirements elicitation is to understand the stakeholders' needs and constraints, and form the system requirements. But gathering requirements correctly, completely and understandably in a natural way is a great challenge to traditional methods, for requirements analysts always play key roles in the elicitation process dominantly while stakeholders participate in passively. Therefore, strategies that help the identification of requirements based on reducing the requirements analysts' dominance and promoting stake-holders' self-expression and self-improvement are welcomed. This paper reports a controlled experiment to evaluate the Business Process oriented Collab.rative Requirements Acquisition and Refining (BPCRAR) method. Compared to JAD, the statistical results show that the requirements elicited by BPCRAR are more complete and understandable. Besides that, the perceived usefulness, ease to learn, and ease of use of BPCRAR are all confirmed by the statistical data got from the questionnaire to the participants. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Refining

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Decoding of color coded structured light using a new color feature 4

Decoding of color coded structured light using a new color f...

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4th International Workshop of Advanced Manufacturing and Automation, IWAMA 2014

作者： Tang, Su Ming Zhang, Xu Tu, Da Wei School of Mechatronic Engineering and Automation Shanghai University Shanghai China State Key Lab. of Digital Manufacturing Equipment and Technology in Huazhong University of Science Technology Wuhan China Shanghai Key Laboratory of Intelligent Manufacturing and Robotics Shanghai China

ISBN: (纸本)9783038352532

In this paper, color coded structured light based on pseudo-random sequence is adopted, and a new decoding method is proposed. It includes three steps. First, the stripe centers are extracted through the use of peak detection. Second, the stripe colors are identified using k-means clustering algorithm on a new color feature with high discriminating power. This feature is related to the spectral sensitivity of red, green and blue sensors, the direction of the illumination source, the normal and albedo of the surface, and the spectral power distribution of the incident light, but it is insensitive to the intensity. Finally, a four-step matching method is presented in sequence matching, which is aim to match the subsequences with the length less than the window size. The experimental results show that our proposed decoding method has advantage of high accuracy. © (2014) Trans Tech Publications, Switzerland.

关键词： Color

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Virtual flux based direct power control for three-level PWM rectifier 17

Virtual flux based direct power control for three-level PWM ...

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2014 17th International Conference on Electrical Machines and systems, ICEMS 2014

作者： Yingchao, Zhang Liping, Jin Yongchang, Zhang Ting, Lu Zhengming, Zhao Key Lab. of Special Power Supply of PLA Chongqing Communication Institute China North China University of Technology Power Electronics and Motor Drive Engineering Research Center China State Key Lab. of Control and Simulation of Power System and Generation Equipments Tsinghua University China

ISBN: (纸本)9781479951611

This paper presents a new control strategy for three-level neutral point clamped (NPC) pulse width modulated (PWM) rectifier without power source voltage sensors. The relationship between instantaneous power and voltage vectors is derived mathematically. Virtual flux is estimated and used to calculate the phase of the power source voltage and instantaneous power. On these bases, a direct power control (DPC) scheme for three-level PWM rectifier is presented. An optimal switching table is established, vector switching scheme and balance strategy for the neutral point potential are discussed. Variable switching frequency and dynamic process of the startup are also analyzed. Experimental results have verified the theoretical approach and the three-level PWM rectifier with proposed DPC based on virtual flux exhibits several advantages, such as simple algorithm, low costs and excellent dynamic performance. © 2014 IEEE.

关键词： Electric rectifiers

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Design of intelligent capabilities in SDN 4

Design of intelligent capabilities in SDN

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2014 4th International Conference on Wireless Communications, Vehicular technology, Information Theory and Aerospace and Electronic systems, VITAE 2014 - Co-located with Global Wireless Summit

作者： Cui, Hongyan Zhu, Yabo Yao, Yuan Yufeng, Li Liu, Yunjie Beijing Key Lab. of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China State Key Lab. of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China Information Engineering University of the People's Liberation Army Zhenzhou China

ISBN: (纸本)9781479946266

Software-Defined Networking (SDN) is an innovative and programmable networking architecture, representing the direction of the future network evolution. In this paper, we propose an architecture to introduce traffic classification techniques into the OpenFlow-based SDN network, which enables the network to be application-aware, so the network could distinguish various applications flows and know the requirements of different flows. Our new architecture also take advantage of the new intelligence to make the network forward traffic flows based flows' demands on bandwidth and delay, which could improve Quality of Service (QoS) of applications and optimize resource allocation all over the network. © 2014 IEEE.

关键词： Quality of service

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Positional translation language model for ad-hoc information retrieval

Positional translation language model for ad-hoc information...

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18th Pacific-Asia Conference on Advances in Knowledge Discovery and Data Mining, PAKDD 2014

作者： Tu, Xinhui Luo, Jing Li, Bo He, Tingting Gu, Jinguang College of Computer Science and Technology Wuhan University of Science and Technology Wuhan China Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System Wuhan China Department of Computer Science Central China Normal University Wuhan China State Key Lab. of Software Engineering Wuhan University Wuhan China

ISBN: (纸本)9783319066042

Most existing language modeling approaches are based on the term independence hypothesis. To go beyond this assumption, two main directions were investigated. The first one considers the use of the proximity features that capture the degree to which search terms appear close to each other in a document. Another one considers the use of semantic relationships between words. Previous studies have proven that these two types of information, including term proximity features and semantic relationships between words, are both useful to improve retrieval performance. Intuitionally, we can use them in combination to further improve retrieval performance. Based on this idea, this paper propose a positional translation language model to explicitly incorporate both of these two types of information under language modeling framework in a unified way. In the first step, we present a proximity-based method to estimate word-word translation probabilities. Then, we define a translation document model for each position of a document and use these document models to score the document. Experimental results on standard TREC collections show that the proposed model achieves significant improvements over the state-of-the-art models, including positional language model, and translation language models. © 2014 Springer International Publishing.

关键词： Information retrieval

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High-efficiency, broad-band and wide-angle optical absorption in ultra-thin organic photovoltaic devices

High-efficiency, broad-band and wide-angle optical absorptio...

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作者： Wang, Wenyan Hao, Yuying Cui, Yanxia Tian, Ximin Zhang, Ye Wang, Hua Shi, Fang Wei, Bin Huang, Wei Key Lab. of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Yanchang Road 149 Shanghai 200072 China Nanjing 210046 China

Metal nanogratings as one of the promising architectures for effective light trapping in organic photovoltaics (OPVs) have been actively studied over the past decade. Here we designed a novel metal nanowall grating with ultra-small period and ultra-high aspect-ratio as the back electrode of the OPV device. Such grating results in the strong hot spot effect in-between the neighboring nanowalls and the localized surface plasmon effect at the corners of nanowalls. These combined effects make the integrated absorption efficiency of light over the wavelength range from 400 to 650 nm in the active layer for the proposed structure, with respect to the equivalent planar structure, increases by 102% at TM polarization and by 36.5% at the TM/TE hybrid polarization, respectively. Moreover, it is noted that the hot spot effect in the proposed structure is more effective for ultra-thin active layers, which is very favorable for the exciton dissociation and charge collection. Therefore such a nanowall grating is expected to improve the overall performance of OPV devices. © 2014 Optical Society of America.

关键词： Light absorption

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High resolution radar target recognition based on distributed glint

High resolution radar target recognition based on distribute...

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2013 International Conference on Mechatronics and Automatic Control systems, ICMS 2013

作者： Li, Baoguo Qi, Zongfeng Zhou, Ying Lei, Jing State Key Lab. of Complex Electromagnetic Environ. Effects on Electronics and Info. System of China Luoyang China School of Electronic Science and Engineering National University of Defense Technology Changsha China

ISBN: (纸本)9783319012728

To solve the problem of aspect angle sensitivity of range profile while used in radar target recognition, the concept "distributed glint" is presented for high resolution radar. The detailed deducing procedure of "distributed glint" is given through theoretical analysis. A new target recognition strategy based on range profile and distributed glint is proposed. Computer simulation proves that this method can greatly enhance the performance of recognition strategy based on range profile. © Springer International Publishing Switzerland 2014.

关键词： Radar target recognition

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